
Over 2024โ2025 ChatGPT and its sibling models shifted from being purely conversational LLMs to offering end-to-end deep research capabilities:

The O3-Deep-Research model is OpenAIโs flagship agent designed for autonomous, multi-step research workflows. Launched as part of the Deep Research API, it leverages advanced reasoning capabilities to plan, search, analyze, and synthesize information across diverse web sources, delivering expert-level reports within minutes .